Spring的Bean生命周期方法

 

 代码实现：

PersonService.java

package cn.itcast.beanlife;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class PersonService implements BeanNameAware,BeanFactoryAware,ApplicationContextAware,InitializingBean,DisposableBean{
	private String name;

	public PersonService() {
		super();
		System.out.println("构造函数被调用");
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		System.out.println("setName函数被调用");
		this.name = name;
	}

	@Override
	public void setBeanName(String arg0) {
		System.out.println("BeanNameAware接口  " + arg0);
		
	}

	@Override
	public void setBeanFactory(BeanFactory arg0) throws BeansException {
		System.out.println("BeanFactoryAware接口 " + arg0);
		
	}

	@Override
	public void setApplicationContext(ApplicationContext arg0) throws BeansException {
		System.out.println("ApplicationContextAware接口 " + arg0);
		
	}

	@Override
	public void afterPropertiesSet() throws Exception {
		System.out.println("InitializingBean接口 "+"afterPropertiesSet方法");
		
	}	
	
	public void init(){
		System.out.println("init-method='init' 方法被調用");
	}

	@Override
	public void destroy() throws Exception {
		System.out.println("DisposableBean接口 "+"destroy方法");
		
	}
	
	public void myDestroy(){
		System.out.println("destroy-method "+"destroy方法");
	}
		
}

MyBeanPostProcessor.java

package cn.itcast.beanlife;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

public class MyBeanPostProcessor implements BeanPostProcessor {

	@Override
	public Object postProcessAfterInitialization(Object arg0, String arg1) throws BeansException {
		System.out.println("BeanPostProcessor接口 "+"postProcessAfterInitialization");
		return arg0;
		
	}

	@Override
	public Object postProcessBeforeInitialization(Object arg0, String arg1) throws BeansException {
		System.out.println("BeanPostProcessor接口 "+"postProcessBeforeInitialization");
		return arg0;
		
	}
}

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		xmlns:aop="http://www.springframework.org/schema/aop"
		xmlns:tx="http://www.springframework.org/schema/tx"
		xsi:schemaLocation="
			http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
			http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
			http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
	<bean id="personService" init-method="init" destroy-method="myDestroy" class="cn.itcast.beanlife.PersonService">
		<property name="name">
			<value>wangjiang</value>
		</property>	
	</bean>
	
	<bean id="myBeanPostProcessor" class="cn.itcast.beanlife.MyBeanPostProcessor"/>
		
</beans>

Test.java:

package cn.itcast.beanlife;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {
	public static void main(String[] args) {
		ApplicationContext ac = new ClassPathXmlApplicationContext("cn/itcast/beanlife/applicationContext.xml");
		PersonService ps = (PersonService) ac.getBean("personService");
		System.out.println(ps.getName());
		
	}
}

输出结果：

注意：

      如果使用BeanFactory来创建bean对象，会缺少ApplicationContext以及BeanPostProcessor的before和after方法。输出结果如下所示：